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I Sun elevation for ISS visibility

  1. May 6, 2017 #1
    I use several web sites to search the visible passes of the ISS over a given location.
    Then I calculate the Sun elevation as seen from the ISS and I get surprisingly low elevations; for example, I get ISS magnitude= -3.8 and Sun elevation at the ISS= -19.9 deg.
    I suppose that the atmospheric refraction is very high, but what's the lowest Sun elevation to consider the ISS outside the Earth's shadow?

    Thank you
  2. jcsd
  3. May 6, 2017 #2


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    2017 Award

    Staff: Mentor

    You can look up the ISS height and the radius of Earth and calculate it yourself.

    -19.9 is just at the edge of visibility.
  4. May 7, 2017 #3
    Please, would you post the formulas?
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